/* 时间轴样式 */
.timeline-container {
    position: relative;
    margin-bottom: 40px;
}
.timeline {
    border-left: 4px solid #d7423a;
    padding-left: 20px;
}
.timeline-year {
    font-weight: bold;
    color: #d7423a;
    margin-bottom: 5px;
}
.timeline-event {
    margin-bottom: 20px;
}

/* 视频区域 */
.video-grid {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.video-card {
    flex: 1;
    min-width: 300px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s ease;
}
.video-card:hover {
    transform: translateY(-5px);
}

/* 学术文献 */
.literature-list {
    margin-top: 20px;
}
.literature-item {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 15px;
}
.btn.btn-primary {
    background-color: #d7423a;
    color: white;
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 4px;
}
.btn.btn-primary:hover {
    background-color: #b5362e;
}

/* 学习路径 */
.learning-path {
    padding-left: 20px;
    line-height: 1.8;
}

/* 常见问题折叠面板 */
.faq details {
    margin-bottom: 10px;
    padding: 10px;
    background-color: #f5f5f5;
    border-radius: 6px;
}
.faq summary {
    cursor: pointer;
    font-weight: bold;
}

/* 动画效果 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s forwards;
}
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}